Blowing-engine and the like.



G. N. SCOTT. BLOWING ENGINE AND THE LIKE.

APILIOATION'EILED NOV. 1, 1907.

Patented Nov. 24, 1908.

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0. N. SCOTT. BLOWING ENGINE AND-THE LI'KE.

APILIOATION FILED NOV. 1,1907.

Patented Nov. 24,1908.

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UNITED STATES PATENT orruon.

OLARENCEN. SCOTT, OF BUFFALO, NEW YORK, ASSIGNORTO INTERNATIONAL STEAMPUMP COMPANY, A "CORPORATION OF JERSEY.

BLOWING-ENGINE ZANI) THE LIKE.

Specificajtionof Letters Patent.

Patented Nov. 24, 1908.

Application filed November 1, 1907. Serial No. 400,276.

Improvements -iin Blowing-Engines and the Lilze, fully described andrepresented .in the following specification and the accompanyingdrawings, forming a :part of thesame.

The especial object xOf the present inventi-on is toprovide an improvedconstruction of blowing engines of thoseclasses which the cylinder, orring valves surrounding the cylinder, are moved longitudinally of thecylinder to open and "close theadmis'sion ports, and air is dischargedthrough *delivery ports at the "ends of the cylinders, but the inventionmay be used in other similar air or gas pumps -or compressors in which alarge piston and cylinder are required.

The invention includes the novel feature of a central trunk extendingthrough the cylinder, so as to form a rigid tie between the two'headsand 'a support for the piston, and preferably hollow, so as to conn'ectthe discharge chambers at opposite ends of the pump, important resultsin compactness, accessibility, :alinement, reduced weight of parts anddurability being thus secured- The invention includes, also, a-noveleniean-s which is preferably used for supporting the cylinder orring'va-lves, :and certain more specific features of -construction :andcombinations of parts,'al=l as fully described hereafter andparticularly pointed out in the claims. a

In the accompanying drawings forming :a part of this specification, theinvention is shown as applied in its preferred form to two types ofblowing engines, in which drawf l V Figure 1 is a side elevation of 1ablowing engine of the type employing a movable cylinder. 2 is acentrallongitudinal section of the same. :Fig. 8 is :a cross section on theiline 3 of Fig.2, and Fig.4 is a-view similar to Fig. :2, showingtheinven'tion applied to :a b lowing engine of the type using waives. II V Referringnow particularly to Figs. lto 3, A, B :are the ituboard andou tboar'dheads "of the engine, 0 is the cylinder moving on the headsfor opening :and closing the admission ports, D Zthe piston, E thecentral trunk on which the piston is supported, F the 'outer casinginclosing the air admission ichamber, G the admission pipe, and H the idischarge pipe or elbow, which is connected centrally to the outboardhead B opposite the trunk E. The cylinder C has the usual ai-r admissionports a at opposite ends, and flexible metal discharge valves 6 areshown having spherical or cylindrical backing 10, carried by rods '11adjustable from outside the cylinder. It will be understood, however,that other forms ofdischarge valves may be used, either mechanicallyactuated or automatic, Ribs 12 are preferably used to strengthen theheads and provide separate discharge chambers for the valves 6. Thetrunk E is preferably secured to the inboard head, as shown, by bolts 1connecting the inner end of the trunk with the inner head plate, thetrunk being seated in the head plate so as to accurately center thesame, and at its outer end the trunk passes through and fits a centralopening in the inner plate and is provided with a flange, by which thetrunk is secured-to the inner plate of the outboard head B by bolts 1.The two heads are thus accurately alined and centered by the trunk. Theopening through the outer plate of the outboard head 13, with which thedischarge elbow connects, is preferably made large enough to permit theflange at the outer end of the trunk E to pass "through it, so that thetrunk may be withdrawn from the heads by removing the discharge elbow.The inner plate of the inboard head A is provided with a central openingopposite the trunk, havingaremovable cover 13, and the inner surface ofthis cover 13 may be curved, as shown 'at 2, so as to direct the airdelivered through the valves "1) to'the inboard end of the trunk E,reducing the friction and resistance. As shown in Figs. 1 to 3, the

trunk is "jacketed and pipes 30 provided for cooling fluid, but thejacketing may be omitted,' as shown in Fig. 4.

The piston D may be of any suitable construction, :but that shown inFigs. 1 to 3 is preferred, and forms a specific feature of v theinvention. :In this construction, the piston D :has a vertical 'guideway31 above the trunk E, inwhic'h guideway a bearing piece 32 is verticallyadj-ustablej'by screw stud 33 bearing on the top of the bearing pieceand forming the-abutment for the bearing piece.

This bearing piece carries a wear plate 3 which rests on the trunk E,and on opposite sides of the wear plate 3 are packing rin 's l. Thepiston is provided with hand holes for access to the adjusting screwstud 33, so that the wear plate may readily be adjusted to take up wear,the holes being normally closed by covers 34. The head of the screw stud33 preferably has a rocking bearing on the bearing piece, and for thispurpose is shown as hemispherical and seated in a spherical cavity inthe bearing piece 32, so as to permit the bearing piece 32 to adjustitself as the piston D moves over the trunk E.

In the construction shown, the cylinder C is suspended from above byroller bearings in such a manner as to move freely, and to permitlubrication without interference with the air admission chamber, andthis construction forms a specific feature of the invention. This resultis secured by mounting on the top of the casing F a longitudinal tie ltcarrying oil baths 5, in which run rollers 6 on which run carriages 15,from which the cylinder C is supported by studs 16, these studs beingconnected to ribs 7 on the cylinder formed so as to strengthen thelatter and prevent distortion by its weight. The studs 16 are providedwith adjusting nuts 8 at their upper ends, which nuts bear uponhemispherical washers 9, so that the cylinder may adjust itself to thepressure of the packing rings or other conditions.

The cylinder C is moved by rods 17 com nected to the cylinder atopposite sides, and two levers 18 on rock shaft 19, this rock shaftbeing shown as actuated by a lever and link 20 from crank 21 on the maincrank pin driven by rod 22 from the cross head 23 of the main pistonrod. The piston D is driven by rods 24 at opposite sides of the pistonpassing through sleeves 25 in the inboard head A, and connected to crosshead 26 on the main piston rod.

The construction shown in Fig. t differs from that shown in Figs. 1 to3, and above described, in that the cylinder 0 is stationary, and theadmission ports a are opened and closed by a valve cylinder, which ofcourse may be a continuous cylinder outside the cylinder C, but as shownthe central ,part of this outside valve cylinder is omitted, and the endrings K, forming the valves, connected by ties 27 in distance sleeves 28between the rings, The valve cylinder formed by the rings K may beconstructed and packed in any suitable manner, and, in accordance withthe present invention, is supported from and carried by the carriages15, In the same manner as the air cylinder C, in the construction shownin Figs. 1 to 3. The piston of Fig. 4, moreover, has not the adjustablebearing piece of Figs. 1 to 3, but the wear plate 3 is a ring extendingabout the trunk E, this wear plate and the packing rings 4; being heldin place by a removable ring 35.

The central trunk of the present invention enables very importantresults to be secured, among which are the following and others will beapparent to those skilled in the art. The inboard and outboard heads arerigidly connected together, and their proper alinement fixed by thetrunk, and the engine is self contained and self alined, as the inboardhead may be connected directly to the end of the main frame without tiebars, this also making possible a reduced length of the e11- gine. Theinterior of the cylinde* and all the valves are readily accessible byremoval of the trunk, this being permitted in the construction shown bysimply removing the discharge pipe elbow. The weight of the piston beingcarried on the trunk, the usual inboard and outboard guides to supportthe piston, are not required. The weight of the parts is very materiallyreduced, as with the trunk no inboard or outboard cross heads arerequired and other parts may be made lighter. The diameter of thecylinder may be larger, on account of the support of the piston by thetrunk, thus providing for larger discharge valves and greater dischargevalve area. The air admission is also freer, as it is not interrupted bythe usual tie bars or braces extending through the admission chamberbetween the inboard and outboard heads.

The above applies to the trunk whether closed to the discharge chambersas in the case of a solid trunk or one having closed ends, or open tothe discharge chambers, so as to connect them. \Vith the hollow trunkconnecting the discharge chambers at opposite ends, there is lessfriction on the air on account of the direct discharge of the air from.the discharge valves to the central trunk. With the hollow trunk, acentral opening in the inboard head can be used, so that the removal ofone central. cover gives access to all the discharge valves, and thelong power piston rod can be removed by dc taehing it from the maincross head and pulling the piston rod through the trunk, which isimportant where space is not available at the power end of the enginebut is at the air end. A stronger construction of the cylinder heads ispossible, as it is not necessary to cut away the ribs in the dischargechamber to secure passageway from the valves to the delivery pipe. Theweight of the parts is also reduced largely by carrying the weight ofthe air or valve cylinder on the longitudinal tie resting on the twocylinder heads, as shown, and the bearings for the cylinder supportsecure a smooth easy move ment, enabling light actuating parts to beused. These bearings, also, are entirely re moved from the circulationof refrigerated air, permittin proper lubrication, While this method 0carrying the cylinder secures these results, however, and forms a partof the invention, it will be understood that this is not essential tothe other features of the 4 cylinder and piston longitudinally oi thetrunk.

2. In a gaseous fluid pump, the combination with the air cylinder andpiston, of a central trunk extending through the piston and connectingthe cylinder heads, admission ports extending circumferentially of thecylinder at opposite ends, means actuated by mechanical connections to amoving part of the pump for opening and closing said admission ports,and means for controlling the discharge from opposite ends of thecylinder.

3. In a gaseous fluid pump, the combination with the movable aircylinder and its fixed heads and the piston, of a central trunkextending through the piston and secured to the heads, and means formoving the cylinder and piston longitudinally of the trunk..

4. In a gaseous fluid pump, the combination with the air cylinder andits fixed'heads, the piston, and a discharge connection outside one ofthe heads through which the piston delivers on its stroke in eachdirection, of a central hollow trunk extending through the piston andsecured to the heads and forming a part of the discharge passage.

5. In a gaseous fluid pump, the combination withthe air cylinder and itsfixed heads, the piston, and a discharge connection outside one of theheads, through which the piston delivers on its stroke in eachdirection, of a central hollow trunk extending through the piston andsecured to the heads and connect: ing the discharge chambers at oppositeends of the cylinder, and discharge valves in the heads surrounding thetrunk.

6. In a gaseous fluid pump, the combination with the longitudinallymoving horizontal cylinder and its fixed heads and means for moving thecylinder, of an admission chamber surrounding the cylinder, a centraltrunk extending through the piston and secured to the heads, and asupport for the cylinder outside the admission chamber.

7. The combination with the cylinder and central horizontal trunk, ofthe piston moving on the trunk and having a vertically adjustablebearing piece above the trunk, and means for moving the piston.

8. The combination with the cylinder and central horizontal trunk, ofthe piston and means for moving the piston on the trunk, vertical guides31 in the piston above the trurk, and bearing piece 32 mounted in saidu1 es.

g 9. The combination with the cylinder and central horizontal trunk, ofthe piston and means for moving the piston on the trunk, bearing piece32 in the piston above the trunk, and an abutment having a rockingbearing on the top of the bearing piece.

10. The combination with the central horizontal trunk and the piston andmeans for moving the piston on the trunk, of a longitudinally 'movingair or valve cylinder, means for moving the cylinder, a support abovethe cylinder, and bearings for the cylinder on the support.

11. The combination with the horizontal longitudinally moving air orvalve cylinder and the air chamber outside the cylinder, and means formoving the cylinder, of sup ort 14 above the chamber, rollers 6 carriedy said support, carriages 15 on said rollers, and means for suspendingthe cylinder from the carriages.

. 12. The combination with the horizontal longitudinally moving air orvalve cylinder and the air chamber outside the cylinder and means formoving the cylinder, of support 14 above the cylinder, rollers 6 carriedby said support and carriages 15 on the rollers, studs 16 connected tothe cylinder, and rocking supports for the studs on the carriages.

In testimony whereof, I have hereunto set my hand, in the presence oftwo subscribing witnesses.

CLARENCE N. SCOTT.

Witnesses:

S. B. DAUGHERTY, J H. BUNGE.

